Long, Stephen H., engineer and explorer, was born at Hopkinton, N. H., Dec. 30, 1784, a son of Moses and Lucy (Harriman) Long. He graduated at Dartmouth College, receiving the degree of A. B. in 1809 and the degree of A. M. in 1812. Two years later he was commissioned lieutenant of engineers in the United States army, and from 1815 to 1818 was professor of mathematics in the military academy at West Point. In April, 1819, he was brevetted major and appointed to lead an expedition to explore the territory between the Mississippi river and the Rocky mountains. (See Long's Expedition.) Only a month before receiving this appointment—March 3, 1819—Lieut. Long married Miss Martha Hodgkins of Philadelphia, Pa. After returning from the expedition he spent several years in surveying and building the Baltimore & Ohio and other railroads, and when the United States topographical engineers' corps was organized in 1838 Maj. Long was given an important position in connection with it. After several years of service in this corps he retired from the army and died at Alton, Ill., Sept. 4, 1864.